The lines show the equipotential contours in the plane of three point charges, Q

Question

The lines show the equipotential contours in the plane of three point charges, Q_1, Q_2, and Q_3. The values of the potentials are in kV as indicated for the +5,0, and -5 kV contours. The positions of the charge indicated by the dots. Decide which of the following statement about electric field lines are true, and which are false. The electric field at k is zero. The electric field at j is stronger than at i. The force on an electron at g points to the top of the page. Charge Q_1 is the largest negative charge. Q_2 is a negative charge. Charge Q_2 has the smallest magnitude of all.

Explanation / Answer

a) true,

k is on the same equipotential (remember equipotential is same potential) line of zero volts

b) false,

E decay as 1 / r^2 for large r lower E

c) false

the electric forces are in the plane

d) false,

the most large is Q_3 ( from equipotential lines)

e) false,

because Q_1 is negative and Q_1 and Q_2 form an electric dipole.

f) true,

from equipotential lines

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